Ship&#39;s funnel



Aug. 21, 1928. 1,681,477

I H. was 7 SHIP S FUNNEL Filed Dec. 31, 1924 Patented Aug. 21, 1928.

UNITED STATES PATENT OFFICE.

HANS BASS, 0F HAMBURG-BERGEDOBF, GERMANY.

SHIPS FUNNEL.

Application filed December 31, 1924, Serial No. 759,189, and in Germany January 2, 1924.

. hood right up to the upper edge of the funnel. Any sort ofnarrowing of the crosssectional area of the funnel was always avoided, because a deterioration of the draught was feared as a result of such narrowing.

Now this invention consists in the arrangement of a constriction in the'funnels of ships, because experiments have yielded the surprising result that a strong constriction of the funnel arranged in a particular way causes not only no deterioration but actually an improvement of the draught, and moreover the constriction according to the invention very favourably affects the action of a special induced-draught device.

The subject matter of the invention is illustrated by way of example in the accompanying drawing, wherein Fig. 1 is a longitudinal section of a constructional form of applicants invention.

Figure 2 is a cross section on the line II-II in Figure 1.

According to the invention a boiler 1 is provided in a. known manner with a chimney cowl 2 passing gradually into polygonal or round form at the top; On this chimney cowl is mounted in a known manner the cylindrical funnel 3. According to the inven tion the chimney hood 2 does not pass directly into the cylindrical funnel 3, but at this point is arranged an insertion 4, which consists of a double conical tube and occasions a considerable constriction 5 of the space inside the funnel.

The double cone tube is so shaped that the lower, comparatively short cone exhibits the form of a steep conical jacket, while the upper cone passes over more gradually into the cylindrical cross section of the funnel 3.

In the immediate neighborhood of the point of constriction 5 is further arranfled an insertion 6, extending over the entire 1111 Del, This insertion may be located either entirely in the compass of the funnel 3 or in the compass of the chimney hood 2 or with one. part in the funnel 3 and with the other part in the chimney hood 2. It is essential that its form should be that of a stream-line body, so that the flue gases can flow past it well without forming eddies. Notwithstanding this insertion 6 the cross sections in the lower cone tube are so constructed that they form a stream tube with constantly decreasing cross-sectional area, and consequently the insertion requisite for the housing of the driving engine for the flue-gas propeller or fan forms little or no obstruction.

Now experiments have shown that by such an arrangement of the constriction 5 and of the insertion 6 the natural draught of the funnel is enhanced to a certain extent, for example from 3.5 millimetres column of water to 5' millimetres column of water. Now this increased natural draught can be still further improved by inserting a preffan is required, which again has the advantage that the same can be driven by a driving engine of comparatively low power, for. example a, steam turbine 9 with a comparatively high velocity, so that this driving engine can also easily find room in thesmall ip s ertion 6.

A substantial rise in the efiiciency of the flue-gas fan 7 is obtained by mounting on the top of the insertion 6 a hub 10 with a few vanes 11, only two or three for example.

The vanes 11 are directed oppositely to the direction of rotation 12 of the flue-gas fans 7, and do not extend over the entire diameter of the insertion 4 at this point but are kept substantially shorter. By this means the result is obtained that when the flue gas screw is working the current of fluegas travelling along the walls of the insertion 6 received a twist oppositein direction to the rotation of the flue-gas screw, and consequently leaves the fluegas screw in a di sertion t and in the tunnel 3, these apertures being normally closed by removable covers 15 and 16. In this'manner it is possible to inspect the flue-gas fan 7 and the guide vanes 11 at any time and to take them out ofthe funnel for the'purpose oi cleaning or dismantling.

The insertion (i is furthermore sostrongly constructed that it canbe utilized as a foundation. for the support otthe flue-gas fan and the turbine. lhis is made possible by virtue of the small dimensions and of the resulting slight; weightot the flue-gas fan and of the driving engine (steam-turbine). From this construction there results the great adyantage that a special: foundation connected with the ships hull is superfluous. As the parts of the funnel vary in length owing to'heating the driving engine snares the movements ottheseparts. and-thus main- The tains its" relative position in the funnel.

' clearance between the flue-gas fan and the chimney hood can on this account be reduced,

'w-hereby the efficiency otthelfluegas fan is materially improved. a The invention is illustrated on thefunnel of a single boiler.

ofa plurality of 'boilers, wherein the chimney hoods of the individual boilersare carried into the tunnel bya common intermediate piece.

that Iclaiin is:

1'. A ships smoke stack, comprising a substantially cylindrical funnel, a double conicaldnsert in and conneeted w'itlrthe said fun= nel'to form a: constricted passage therein, the diameter of said passage being substantially less than that of said funnel, a' stream-line member in the funnel mounted underneath the point otconstriction and exhibiting even,

-eddy-preventing guide surfaces, a propeller mounted in the saidanember to hematite plane 1ell'er,-and a; stationary guiding'member sup: ported by the said member and having guid ingi wingsinclinedto guide ina direetion oppositely to the revo'lvingnirectionof the, said propeller, substantially as and-form the of constriction, a turbinearranged within the said member for-driving-the said: propurposeset forth.

2. A ships smokest-ack, comprising a subst-a-ntially cylindrical funnel,- a double conical insert in and connected with the said Obviously howeven the same can also be-emp loyed for the funnel tunnel to form a constricted passage therein, the diameter of said passage being substantially less than that of said funnel, a stream-line member in the said funnel located underneath the point of constriction and exhibiting even, eddy-preventing guide SIH f-EIGGS, a. propeller mounted in the said inc nhen-to. lie in. the plane of constriction, a turbine arranged within the said member f mmperating the said propeller, a stationary guiding member supported by the said memher-and: having: guiding? wings inclined to guide in a direction oppositely to the revolving direction of the said propeller, and an aperture closed by a door, both in the biconical insert" and: in the funnel, substantially as and for the purpose set forth.

I'nduced draft device for smoke stacks, comprising in combination asubstantially cylindricnl funnel, a double conieal' insert in and connected with the funnel to form a constricted passage therein, the diameter of said passage beingsubstantially less than that of said tunnel, a stream-line member in said tunnel mounted underneath the point of constriction, a SCPGW-fh1T of substantially the same diameter as said constricted passage carried by said stream-line member to lie in the' plane of constriction and aturblIlO'lllOllIlliQCl within said stream-line member for driving said! screw tan with high velocity substantially as and forthe purpose set forth 4'. Induced draft: device-for smoke stacks, comprisingin combination a substantially cylindrirv-al funnel, adouble conical insert in and connected with the tunnel to form a constricted" passage therein, the-diameter of saidpassage-being substantially less than that of said funneleastreamdine memberin said: funnel mounted:underneath the point of constriction, .a' screwfan-- of substantially the same diameter as said constricted passage carried by said stream-line member to lie in the plane of constriction, a turbine mountedzivithin said streamlinemember for driving; said serew.-fan with. high velocity andla stationary guiding member supported by said streamvline member. and having guidingwings inelined to guide in a directioiroppositely; to the IGVOlVlHQQdlI'CCilOD' of said; SL'ICWS Efllll substantially. as and for the purpose set forth. 7

5. Induced draftdevricc for smoke stacks, comprising in. combination a substantially cylindrical funnel. adouble conical insert in azndconnected with the funnel to form constricted passage therein, the diameter of said passage being substantially less than that of said funnel, astream-line member in said funnel mounted underneaththe point of ;constriction, a screw-fan ofsubstantially the mounted within said streamdine member for driving said screw-fan with high velocity, a stationary guiding member supported by said stream-line member and having guiding wings inclined to uide in a direction oppositely to the revolving direction of said screw-fan the adjacent walls of the funnel and conical insert being each provided with apertures and doors for closing each of the apertures, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification.

HANS HASS. 

